Screw-bolt pliers



r j s. A. DORSAY.

SCREW BOLT PLIERS.

APPLICAT ON FILED JULY 25. I919.

Patented Mar. 9, 1920.

gamm 0015 Cir SPENCER ALLAN DORSAY, OF ST. CATHARINES, ONTARIO, CANADA.

SCREW-BOLT PLIERS.

Specification of Letters Patent.

Patented Mar. 9, 1920.

Application filed July 25, 1919. Serial No. 313,305.

1 '0 all whom it may concern: I

Be it known that I, SPnNcnn ALLAN Donsnr, ot the city of St. Catharines,in the county of Lincoln, in the Province of Ontario, Canada, haveinvented certain new and useful Improvements in Screw-Bolt Pliers, ofwhich the following is a specification.

My invention relates to improvements in screw bolt pliers and the objectof the in vention is to devise means in a pair of pliers forengaging thecross groove of the screw bolt thereby preventing the slipping of thepliers when unscrewing the bolt and it consists essentially of thefollowing arrangement and construction of parts as hereinafter moreparticularly explained.

Figure 1, isa perspective view of the upper portion of a pair of pliersshowing my device connected therewith.

Fig. ,2, is a side elevation 01* the jaw portion of a pair of pliersshowing the upper portion of the jaw members in section.

In the drawings like characters of reference indicate correspondingparts in the various figures.

1 indicates the major portion of a pair of pliers. 2 and 3 are the jawsof the pliers provided in their inner faces with recesses 4 and 6 is amember located between the jaws 2 and 3 provided with a screw driveredge 7 at its upper end,'a cross slot 8 inter mediate of its length anda cross orifice 9 in proximity to its lower end. 10 and 11 are a pair oflinks pivotedly connected together and to a. member 6 by a cross pin 12within the slot 8. The opposite end of the links are pivoted withinrecesses and 5 by pins 18 and 1 1. 15 and 16 are orifices formed in thejaws 2 and 3 at their lower end. The inner ends of the orifices 15 and16 are flared upward at 17 and 18. V 19 is a stiff wire which extends atits end freely into the orifices 15 and 16 and through the orifice 9 ofthe member 6 intermediate of its length. 20

and 21 are compression springs extending around the wire 19 between thejaws 2 and'3 and each side of the member G; N hen the jaws 2 and 3 ofthe wrench are opened, the links 10 and 11 arespread toward horizontalposition and thereby draw the upper end 7 of the member 6 inward. Thewire 19 tends to assume the straight line, the lower end of the member 5being held in position by the springs 20 and 21. When the jaw members 2and 3 are closed so as to grip 1. The combination with a pair of plierjaws, adapted to grip the head of a screw belt, of a screw driver membersupported between the jaw members and adapted to engage the cross grooveof the bolt, to prevent slipping of the jaws inoperation.

2. The combination with a pair of plier jaws, adapted to grip a screwbolt head, of a screw driver member supported between the jaws, meansoperated by the closing of the jaws for carrying the screw driver memberoutward into engagement with the groove of the head and by opening thejaws for carrying the screw driver member inward out of engagement withthe groove of the head, the said member when engaged with the grooveserving to prevent slipping of the jaws relative to the bolt head.

3. The combination with a pair of plier.

jaws, of a screw driver member located between the jaws, links pivotedlyconnected at thelr inner ends to the screw driver member and at theirouter ends to the plier jaws, and

surrounding the wire between the plier jaws and each. side of" the screwdriver member.

5. The combination with a pair of plier jaws, of a work-engaging membersupported by saidjaws and movable therewith into engagement with thework, the said member serving to prevent slipping of the jaws relativeto the work during operation of the tool.

SPENCER ALLAN DORSAY.

